How to Use the Command 'weasyprint' (with Examples)
WeasyPrint is a powerful command-line tool used to convert HTML documents into high-quality PDF or PNG files. It provides a seamless way to convert web pages or HTML content into a format suitable for printing or distribution, while maintaining the layout, styling, and fidelity of the original material. With support for custom stylesheets, resolutions, and log verbosity, WeasyPrint is an excellent choice for developers and designers who need straightforward and efficient conversion.
Render an HTML File to PDF
Code:
weasyprint path/to/input.html path/to/output.pdf
Motivation:
Converting an HTML file to a PDF is a common requirement for generating electronic documents that are universally accessible and retain the design and structure of the original HTML. PDFs are widely used in business, education, and personal use due to their compatibility with different devices and operating systems. With this command, users can generate a professional-looking PDF from any HTML file without the need for additional software or plugins.
Explanation:
weasyprint: The command used to initiate the conversion process.path/to/input.html: Specifies the location of the HTML file to be converted.path/to/output.pdf: Determines the destination and filename for the resulting PDF file.
Example Output:
After running this command, ‘input.html’ is rendered into a PDF format and stored as ‘output.pdf’ in the specified path. The document will look precisely like the original HTML page with images, text, and layout preserved.
Render an HTML File to PNG, Including an Additional User Stylesheet
Code:
weasyprint path/to/input.html path/to/output.png --stylesheet path/to/stylesheet.css
Motivation:
There are scenarios where visual content from an HTML page is needed as an image, such as embedding into emails or other documents where PDF might not be suitable. Adding a stylesheet allows users to customize or override some aspects of the page’s appearance during the conversion. This flexibility ensures that the public-facing image fits desired branding or visual aesthetics.
Explanation:
weasyprint: The tool for rendering HTML content.path/to/input.html: Indicates the HTML file to convert.path/to/output.png: Sets the location and name for the generated PNG file.--stylesheet path/to/stylesheet.css: Applies an additional stylesheet to modify or enhance the appearance of the HTML content during conversion.
Example Output:
Running the command outputs an image file ‘output.png’, reflecting the styled HTML content. The provided CSS is applied, which may change text colors, fonts, or even structures, reflecting any design changes on the generated PNG.
Output Additional Debugging Information When Rendering
Code:
weasyprint path/to/input.html path/to/output.pdf --verbose
Motivation:
Developers and designers often need to troubleshoot issues related to the conversion process. The verbose flag offers detailed debugging information and logs that can help identify errors, warnings, and the conversion pipeline’s processing overview. This is crucial for understanding why a particular conversion might not look as expected.
Explanation:
weasyprint: Initiates the conversion.path/to/input.html: The path to the input HTML file.path/to/output.pdf: Designates the destination PDF file.--verbose: Enables detailed logging of the conversion process.
Example Output:
Upon execution, the conversion process logs detailed information in the console or terminal. This includes stages of rendering, potential errors, and warnings, giving the user insight into the conversion process.
Specify a Custom Resolution When Outputting to PNG
Code:
weasyprint path/to/input.html path/to/output.png --resolution 300
Motivation:
Image resolution is crucial for ensuring the quality of the output, especially when images will be printed or displayed on high-resolution devices. By specifying a higher resolution, users can produce crisp and clear images suitable for professional presentations or high-quality prints.
Explanation:
weasyprint: Command for HTML conversion.path/to/input.html: Path to the HTML document to be converted.path/to/output.png: Sets the file name and location for the resulting image.--resolution 300: Instructs WeasyPrint to render the PNG at 300 DPI (dots per inch), suitable for print media.
Example Output:
This command produces an output image ‘output.png’ with a sharper and more defined appearance, ideal for scenarios demanding high-definition visuals.
Specify a Base URL for Relative URLs in the Input HTML File
Code:
weasyprint path/to/input.html path/to/output.png --base-url url_or_filename
Motivation:
When working with HTML files containing relative paths to resources like images, stylesheets, or scripts, it’s essential to set a base URL so WeasyPrint knows where to find these assets. This feature ensures all linked resources are correctly included in the output, maintaining the integrity and functionality of the content.
Explanation:
weasyprint: The execution command for file conversion.path/to/input.html: Path to the HTML file being processed.path/to/output.png: Points to where the converted image will be saved.--base-url url_or_filename: Provides a base path for resolving relative URLs in the HTML, allowing links to function correctly.
Example Output:
The command ensures ‘output.png’ includes all visual and linked elements from the HTML file, utilizing the given base URL to locate them correctly.
Conclusion
WeasyPrint’s versatile command-line options make it a compelling tool for converting HTML files into PDFs or PNGs, suitable for various professional, educational, and personal uses. By leveraging its capabilities to adjust styles, resolutions, and debugging output, users can produce tailored, high-quality documents and images fitting their specific requirements.
